Distribution valve



- Dec. 16, 1930. c. w. DAKE DISTRIBUTION VALVE Filed March 16, 1928 2 Sheets-Sheet l INVENTQR Ckarlep W13 ATTORNELS Dec. 16, 1930. c. w. DAKE DISTRIBUTiON VALVE Filed March 16, 1928 2 Sheets-Sheet 2 INVENTOR WmrZaS W 261% ATTORNEYS Patented Dec. 16, 1936.

2 UNITE STATES PANY, on crnoneo, ILL NOIS, A conrone'rronor new JnnsEY DISTRIBUTION verve Application filed March 16, 1928.- Serial No. 262,247..

B with its bull ring-B 135 13 are'spools My invention relates to improvements in distribution valves for steam engines and the like, andhas for one objectto provide a new and: improved form of distribution valve wherein" by the valve structure itself, without a change in the valve gear,it is possible to obtain both a rnai'n and an auxiliary cutoff. One object of the invention is to provide such a valve wherein the passages "which provide the main and auxiliarycutofi effect are sell? contained and renewable in the valve. Another object is to provide such' passages so arranged as toprevent explosive eii ect. Another object is to provide an arrangement of passages to give major and minor; cutofi wherein thesupply of steam during the time between main cutoff and auxiliary cutoi'l' will be substantiallycontinuous and under accu rate control. Other ob1ects w1llappear from time to time in the SPGClflCfltlOIl.

My invention is illustrated more or lessdi agrannnatically in the accompanying drawings, wherein l Figure 1 shows a vertical section through the valve bushings with the piston in side elevation and in part section; c Figure 2 1S asection along the line 2+2 of Fig. 1;

Figure 3 is a perspective view of one of the I packing rings.

A is a crank end and A the head end bushing. They are both ported at A The valve chest which contains these bushings and holds them inproper position is not 1llus-' T trated and forms no part of the invention.

Suffice it to say that steamis admitted from the boiler into the space A between the two bushings and travels through the bushingsin the direction of the arrows X, being discharged outwardly to the engine in the direc tion of the arrows Y. The exhaust passes back through the ports A and is discharged from the ends of the bushings in the direc- 7 tion of the arrows Z.

B is the valve stem providediwith a shoulder B upon which abuts the hub B of a' follower spider 13 which spider is flanged to support and hold the bull ring B At the head end of the stem there is no shoulder but a nut B engages a similar follower spider sides with the channel C rings are the ordinary type of spring rings" which support the inner ends. of the bull rings and B is the filler sleeve whichjoins the two spools; "The nut 13, when tightened up, exerts a longitudinal pressure upon? the filler, the spools, thebullrings and the follower spiders to hold the piston valve .to-'

gether as a unit assembly."

Each bull ring 13 has a packing ring C at the end, a packing ring G intermediate the ends, and a relatively wide ring C at the cutoff edge oft-he bull ring. The purpose of these packing rings is to provide a steamtight connectionbetween the piston and the bushing. It is obvious that if it'were possible to build a piston theexpansion and contrac-; tion of which, withrespect t'o the bushing, was such under various conditions of heat that binding would not take place, the pieton and bushing might be fitted so asfto'rnake the spring rings unnecessary. Primarily, then, the function of the spring rings is to bridge the necessary gap between the piston and the bushing; If the rings were dispensed with, or it they were integral with the piston, the cutoff edges formed by the rings would, of course, be formed in the'pistonbody itself. The ring C is providedyon' its inner periphery with an inwardly extending flangeC and:

is channeled about its entire outer periphery as at G, sofas to provide in effect two packng ring elements engaging the bushing.

The inner "element. Ciprovides the main cutoff edge: The outer element C provides the auxiliary cutoffedge. The inner element 0 PATENT oF F IcE M CHARLES w. DAKE, on CHICAGO, I LINoIs, ASSIGNOR TO THE PYLE-NATIONALCOM- is 'cut away. as at C to forn'ra port, or longitudinal channel-which communicates on both All three of the" G into the channel C"! andout to the engine between the auxiliary cutoff edge and the edge of the port, and this continues until the cutoff edge has completed its traverse and the member C has been brought into engagement with the bushing beyond the port. This arrangement permits the steam to circulate to some extent in the peripheral channel and makes the flow of steam during the time between main and auxiliary cutofi independent of the length of the channel C and puts the control of the auxiliary supply of steam up to the auxiliary cutoff edge only. By this arrangement the part of the valve which is subjected to the most intense erosion of the steam, namely, that part over which the steam wipes during the time between main and auxiliary cutoff, is renewable Without renewing the entire valve.

It will be understood that while I have used the term cut-off and cut-off edge in connection with the application of my invention to a distribution valve. that this term is primarily used as a descriptive term. and that my invention is equally applicable and in tended so to be used in connection with any one of the fluid control edges of the valve.

I claim:

1. A distribution valve mechanism for steam engines and the like, comprising a ported bushing, a piston adapted to reciprocate therein, a spring ring mounted on the piston, a peripheral channel in the outer face of the ring, and a longitudinal channel extending through one side of the ring and oining the peripheral channel. 7

2. A distribution valve mechanism for steam engines and the like, comprising a ported bushing, a piston adapted to reciprocate therein, a spring ring mounted on the piston peripherally channeled to form on one side of the channel a maincutoff edge. on the other side an auxiliary cutoff edge, and a longitudinal channel through the main cutoff edge communicating with the peripheral channel.

3. A distribution valve mechanism for steam engines and the like, comprising a ported bushing, a piston adapted to reciprocate therein. a spring ring mounted on the piston, a peripheral channel in the outer face of the ring, and a longitudinal channel extending through one side of the ring and joining the peripheral channel, the spring ring being wider, measured in a direction pa 'allel with the axis of the piston, than its thickness measured radially, and being interiorly flanged.

4; A distribution valve mechanism for steam engines and the like, comprising a ported bushing, a piston adapted to reciprocate therein, a spring ring mounted on the piston peripherally channeled to form on one side of the channel a main cutoff edge, on the other side an auxiliary cutoff edge, and a longitudinal channel through the main cutoff edge communicating With the peripheral channel, the spring ring being Wider, measured in a direction parallel with the axis of the piston, than its thickness measured radially, and being interiorly flanged.

A distribution valve mechanism for steam engines and the like, comprising a ported bushing, a piston adapted to reciprocate therein having main and auxiliary cutoff edges, a peripheral channel interposed between said edges and a longitudinal channel extending through the main cutoff edge and communicating with said channel, the bottom of the channel being depresed below the face of the remainder of the piston where it contacts the bushing.

6. A distribution valve mechanism for steam engines and the like, comprising a ported bushing, a piston adapted to reciprocate therein having main and auxiliary cutoff edges, a peripheral channel interposed between said. edges and a longitudinal channel er-ttending through the main cutoff edge and communicating with said channel, the eflcctive diameter of the piston at the channel bein g than the effective diameter of the piston at the cutoff edges, the bottom of the channel being depressed below the face of the remainder of the piston where it contacts the bushing.

Signedv at Ghicago, county of Cook and State of Illinois, this 13th dav of March, 1928. CHARLES V. DAKEv 

